Water: Module 4
Basic Course: Key Concepts (Module 4.i)
- Module 1: Overview
- Module 2: Use
- Module 3: Criteria
- Module 4: Antidegradation
- Module 5: Flexibilities
- Module 6: Review
- Certificate of Completion
The existing uses of a water body must be protected.
Within limitations, a State/Tribe has the discretion to allow activities that could degrade water quality to a level that protects existing uses.
A State or Tribe's water quality standards must include an antidegradation policy and must specify both when the policy will be applied and what decision-making criteria will be used.
- A State or Tribe's antidegradation program must include criteria specific to three categories: existing uses, high quality uses, and ONRWs.
Antidegradation policy can apply to both point and non-point source activities.
The community and other stakeholders must be given an opportunity to provide input as part of the decision-making process regarding a particular application of the policy to a water body.
- EPA Regional Offices review both new and revised antidegradation programs developed by States and Tribes.